n1 = 0.1;
n2 = 0.2;
print(n1+n2)


# 四舍五入
n3 = round(n1+n2,2);
print(n3)


import math
# 向上取整
n4 = math.ceil(n1+n2)
print(n4)
#向下取整
n5 = math.floor(n1+n2);
print(n5)
